It definitely seems to come and go. I noticed The Economist on the list of magazines available for OnePass miles several months ago. I did whatever I needed to do at the website and then didn't hear anything for like 6 weeks - I figured everything was all messed up. But in the middle of September, they took the 3200 miles from my account. And the mailing label is now showing that the subscription had been extended a year. So it worked for me with OnePass miles as recently as late summer.